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煤与瓦斯突出区域分岔区岩爆的前兆特征及影响因素研究。

Study on the precursory characteristics and influencing factors of rockburst in the bifurcation area of coal seam.

机构信息

School of Civil Engineering, Nanyang Institute of Technology, Nanyang, Henan, PR China.

Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures, Nanyang Institute of Technology, Nanyang, Henan, PR China.

出版信息

PLoS One. 2024 Aug 23;19(8):e0306811. doi: 10.1371/journal.pone.0306811. eCollection 2024.

DOI:10.1371/journal.pone.0306811
PMID:39178240
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11343370/
Abstract

To explore the precursory characteristics and influencing factors of rockburst in the bifurcation area of coal seam, the evolution and expansion of fracture and the energy accumulation and dissipation characteristics of coal-rock parting-coal structure (CRCS) during failure and instability process are explored from a micro-scopic perspective, and the influence of coal and rock parting parameters on the instability is studied. The following four points are addressed: (1) Compared with the single coal structure or the coal- rock combined structure, the CRCS can more directly reflect the geological structure characteristics of the coal seam in the bifurcated area; (2) The failure and instability process of CRCS includes two types of instability: slip and fracture. The slip instability is characterized by low strength and high energy release, which is very difficult to predict. (3) Before the failure of CRCS, there are several precursor signal characteristics, such as the shortened development time of the "stable-fracture-stable" cycle, abnormal slip dislocation of the contact surface, and rapid accumulation of rock fracture energy. (4) The inclination angle of the contact surface affects the instability form, the strength of the rock parting affects the instability state, and the thickness of the rock parting affects the impact tendency. The research results have important theoretical significance for preventing rockburst caused by failure and instability in bifurcated area of coal seam.

摘要

为了探究煤层分叉区域岩爆的前兆特征及其影响因素，从微观角度研究了断裂的演化扩展以及煤岩分层-煤结构体（CRCS）在破坏失稳过程中的能量积聚与耗散特性，并研究了煤岩分层参数对不稳定的影响。具体涉及以下四个方面：（1）与单一的煤结构或煤-岩组合结构相比，CRCS 更能直接反映分叉区域煤层的地质结构特征；（2）CRCS 的破坏失稳过程包括两种类型的不稳定：滑移和断裂。滑移不稳定的特点是强度低、能量释放高，很难预测；（3）在 CRCS 失效之前，存在几个前兆信号特征，例如“稳定-断裂-稳定”周期的缩短发展时间、接触面的异常滑移错位以及岩石断裂能量的快速积累；（4）接触面的倾斜角度影响不稳定的形式，岩石分层的强度影响不稳定的状态，岩石分层的厚度影响冲击的倾向。研究结果对预防因煤层分叉区域破坏失稳而引发的岩爆具有重要的理论意义。

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